Need some help w/ OEV203 (Sony PVM-20M2) Vertical Collapse after recap.

[kaizo4life]

Hello everyone! I have an Olympus OEV203 (re-badged Sony PVM-20M2) and it had the horizontal RGB lines that indicate a few caps on the deflection circuit needed replacement before a more serious fault occurred. I have done a few recaps / transistor replacements on vintage audio stuff, but outside of being able to solder fairly well I have very limited troubleshooting skills.

I was wondering if anyone here could point me in the right direction on what to check. When I fired up the monitor nothing went up in smoke, and when I bring up the OSD menu, it appears everything else is working fine besides the screen being collapsed to a line.

I have 12v at r592. Removing the board again to inspect revealed all my soldering looks good. Caps are in the correct orientation and correct values. Nothing looks off top / or bottom on the A board. I am not awesome with schematics, but some basic continuity checks seem good. I am at a loss for where to start.

I was looking at another thread here viewtopic.php?hilit=sony%20vertical%20c ... 214671fd1b

Someone suggested checking the voltage at two diodes d528 and d530 and to look for 24 and 50v respectively. I did measure those and got 30v on both. I am not sure if that will help.

I am really hoping to learn more about basic troubleshooting, it's kind of daunting without someone to show you the ropes.

Thanks in advance everyone! I hope I can revive this beautiful PVM.

[Josh128]

Just a cursory ask, you did double check the vertical deflection coil connections? I once blew a horizontal output transistor on a monitor after pulling the yoke and working on it. When I *carefully* reassembled the monitor and powered it on, it had a bright vertical line in the center of the screen. I powered it off, but not quickly enough, I suppose. Found I had forgotten to reconnect horizontal deflection coil connector to the main board. When I connected it and tried again, it was too late.

Or maybe Im misunderstanding-- your menu looks fine, just inputs are not?

[kaizo4life]

It all squished but its a fat enough line where I can see the menu working.

I did find something interesting, When I have my meter in continuity mode and black probe on a ground. None of the pins of q515 will beep, but the other adjacent IC's at least of of the pins has continuity relative to ground. Also, if I put my meter on each raised lead of r1528 in beep mode there is no beep. I want to say r1528 read about 400ish ohms in circuit. Same with r538 which is close by no beep with meter on each of the legs and I want to say r538 read a little over 1k ohms in circuit. Not sure if I am on to some, but perhaps q515 (v.out 2 ic I believe could be fried)

That is the best I have so far

[kaizo4life]

I'm going to go back through each cap that was replaced pull it and check the pads, any other ideas would be appreciated. Feeling discouraged.

[daveyheats]

Hey Kaizo, did you ever fix this problem? As my PVM has the same issue and very similar voltage readings at those two diodes. Not sure where to look next!